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Financial Risk Management - Summary of Aging Analysis of Gross Values of Trade Receivables and Contracts Assets by Risk Category (Detail) - SEK (kr) kr in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | kr 53,902 | kr 52,799
Not due [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 45,864 | 45,164
Maturity within 3 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 4,388 | 3,772
Later than 3 months and not later than 6 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 524 | 858
Later than 6 months and not later than 12 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 571 | 558
Longer than 1 year [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 2,555 | 2,447
Country risk Low [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 37,489 | 30,767
Country risk Low [member] | Not due [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 33,801 | 27,431
Country risk Low [member] | Maturity within 3 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 2,914 | 2,434
Country risk Low [member] | Later than 3 months and not later than 6 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 243 | 445
Country risk Low [member] | Later than 6 months and not later than 12 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 270 | 137
Country risk Low [member] | Longer than 1 year [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 261 | 320
Country risk medium [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 11,395 | 16,251
Country risk medium [member] | Not due [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 9,379 | 14,369
Country risk medium [member] | Maturity within 3 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 1,025 | 826
Country risk medium [member] | Later than 3 months and not later than 6 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 164 | 227
Country risk medium [member] | Later than 6 months and not later than 12 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 168 | 224
Country risk medium [member] | Longer than 1 year [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 659 | 605
Country risk high [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 5,018 | 5,781
Country risk high [member] | Not due [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 2,684 | 3,364
Country risk high [member] | Maturity within 3 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 449 | 512
Country risk high [member] | Later than 3 months and not later than 6 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 117 | 186
Country risk high [member] | Later than 6 months and not later than 12 months [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | 133 | 197
Country risk high [member] | Longer than 1 year [member] |  |
Disclosure Of Credit Risk Exposure [Line Items] |  |
Aging analysis by risk category | kr 1,635 | kr 1,522

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